Shorter buildings are almost always more efficient, literally speaking and energy-wise. Most supertalls are built in the quest of winning the dick-wagging contest of who has the tallest building, not as something for logic's sake

A basic fact and yet a lot of people will ream you on forums like this for saying it. Going over ~800ft has no purpose other than dick-waving and makes no engineering sense. The only reason it makes economic sense in some cases is because the super-rich will pay handsomely for the right to wave their dicks. It's a conspicuous consumption sort of deal. "Look at me, I'm so rich I can waste tons of money on a gigantic phallic symbol to compensate for my erectile dysfunction".

Update: This building has already exeeded 300 meters in height for nearly 2 months already, thus exceeding supertall status, and it means about half the height of the building is complete. I guess it is around 320-335 meters by now. I hope it can be completed quickly, Because I'm a HUGE fan of skyscrapers and a HUGE, HUGE fan of the Wuhan Greenland Center. I want to go see it, take photos, and even go in its observation deck and stay in it too.

lift cores have to be so big for super/megatalls as they now form part of the office space
(as in one part of the office will be concrete enclosed, the other glass). The lifts
themselves are only in the central bit, not the arms.